Quad screen

I just had my 16 week appt I'm 16 w 3 d and my doc offered the quad screening he made some valid points so I agreed.. I'm not stressed because at least if anything is worrying I can just get the free cell Dna test that I didn't qualify for. Anyone else get the quad screening done? I should hear results in 7-10 days.. I believe my baby is happy and healthy and growing just as he or she should but it's still nerve racking..